Water Juggling
Logic puzzles require you to think. You will have to be logical in your reasoning.
Here's what you have:
Two 8liter jugs, filled with water
One 3liter jug, empty
Four infinite size, empty pools
Here's what your objective is:
Fill each of the four pools with exactly 4 liters of water.
Here are your constraints:
You have nothing else at your disposal.
There is no other water aside from the two 8liter water filled jugs.
Once water is poured into any of the 4 pools it cannot be removed from there.
The jugs are not symmetric so you cannot measure amount by eye or judge based on shape.
HintI am not sure how to help you :). I solved this in 24 steps (you may have more or less). It helps to label the jugs and pools, and then draw. Oh, main key, try to work backwards, from filled pools, and see what final steps are even possible.
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Answer
It's not short but it's right  use a piece of paper and follow the steps using A, B, C and pools. Change the quantities in each as you complete each step  it is worth it to see it come out right.
Lets label the jugs.
Jug A  first 8liter
Jug B  second 8liter
Jug C  3liter.
The four infinites are pool 1, pool 2, pool 3, and pool 4.
1. Jug A to Jug C
2. Jug C to pool 1
3. Jug A to Jug C
4. Jug A to pool 2
5. Jug C to Jug A
6. Jug B to Jug C
7. Jug C to Jug A
8. Jug B to Jug C
9. Jug C to Jug A
At this point, we have:
Jug A  8
Jug B  2
Jug C  1
Pool 1  3
Pool 2  2
Pools 3&4  empty
10. Jug C to pool 3
11. Jug B to Jug C
12. Jug A to Jug C
13. Jug C to Jug B
14. Jug A to Jug C
15. Jug C to Jug B
16. Jug A to Jug C
17. Jug A to pool 4
At this point, we have:
Jug A  0
Jug B  6
Jug C  3
Pool 1  3
Pool 2  2
Pool 3  1
Pool 4  1.
18. Jug C to Jug B
19. Jug C to pool 1
20. Jug B to Jug C
21. Jug C to pool 3
22. Jug B to Jug C
23. Jug C to pool 4
24. Jug B to pool 2
... And we end up with the desired result:
Jug A  0
Jug B  0
Jug C  0
Pool 1  4
Pool 2  4
Pool 3  4
Pool 4  4
Tough, but workable.
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